如何检索嵌套在JSONObject中的URL？

import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class URLRetriever {
    public static List<String> retrieveURLs(JSONObject jsonObject) {
        List<String> urls = new ArrayList<>();
        String jsonString = jsonObject.toString();

        // 正则表达式匹配URL
        String regex = "(http|https)://[\\w\\-_]+(\\.[\\w\\-_]+)+([\\w\\-.,@?^=%&:/~+#]*[\\w\\-@?^=%&/~+#])?";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(jsonString);

        // 提取匹配到的URL
        while (matcher.find()) {
            String url = matcher.group();
            urls.add(url);
        }

        return urls;
    }

    public static void main(String[] args) {
        // 示例JSONObject
        JSONObject jsonObject = new JSONObject("{\"name\":\"John\",\"age\":30,\"website\":\"https://www.example.com\",\"address\":{\"street\":\"123 Street\",\"city\":\"New York\",\"country\":\"USA\"}}");

        // 检索嵌套在JSONObject中的URL
        List<String> urls = retrieveURLs(jsonObject);

        // 打印提取到的URL
        for (String url : urls) {
            System.out.println(url);
        }
    }
}